U.S. soldier at camp during World War II. Secrecy (also called clandestinity or furtiveness) is the practice of hiding information from certain individuals or groups who do not have the need to know, perhaps while sharing it with other individuals. That which is kept hidden is known as the secret.
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The X-1, piloted by Chuck Yeager, was the first manned airplane to exceed the speed of sound in level flight and was the first of the X-planes, a series of American experimental rocket planes (and non-rocket planes) designated for testing of new technologies and often kept secret.